java.lang.NoClassDefFoundError: org/springframework/util/StreamUtils

求大神们解惑 spring整合mybaits，前台ajax成功传数据到后台controller，通过注解@ResponseBody返回字符串到前台的时候出错 java.lang.NoClassDefFoundError: org/springframework/util/StreamUtils] with root cause java.lang.NoClassDefFoundError: org/springfra ...